/*
 * Copyright 2013 JROSE
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jrose.core.util;

import lombok.AccessLevel;
import lombok.NoArgsConstructor;

import java.lang.annotation.Annotation;

/**
 * Annotation related helper utilities.
 *
 * @author Xiaohai Zhang
 * @since 2013-08-19 15:23
 */
@NoArgsConstructor(access = AccessLevel.PRIVATE)
abstract public class AnnotationUtils {
    public static boolean isAnnotationPresent(Class<?> clazz, Class<? extends Annotation> annotationClass) {
        if (clazz == null) {
            throw new NullPointerException();
        }
        Class<?> classForUse = clazz;
        while (classForUse != null) {
            if (classForUse.isAnnotationPresent(annotationClass)) {
                return true;
            }
            classForUse = classForUse.getSuperclass();
        }
        return false;
    }

    public static <A extends Annotation> A getAnnotation(Class<?> clazz, Class<A> annotationClass) {
        if (clazz == null) {
            throw new NullPointerException();
        }
        Class<?> classForUse = clazz;
        while (classForUse != null) {
            A annotation = classForUse.getAnnotation(annotationClass);
            if (annotation != null) {
                return annotation;
            }
            classForUse = classForUse.getSuperclass();
        }
        return null;
    }
}
